Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 207, NWS Tucson, AZ

October 5, 2021Graham County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Oct 5, 2021, 4:18 PM MST for Graham County, Arizona. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 5, 2021, 4:18 PM MST (23:18 UTC)
Expired: Oct 5, 2021, 4:48 PM MST
In force: 30 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Graham County, AZ

The radar

The Phoenix radar (KIWA), 128 km from the middle of the area, began a volume at 23:22 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 5, 11:46 AM MST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 11.3 hours before the alert went out and 143 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 4 J/kg
Mixed-layer CIN: -376 J/kg
Mixed-layer LCL: 2029 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

210 
WUUS55 KTWC 052318
SVRTWC
AZC009-060000-
/O.NEW.KTWC.SV.W.0207.211005T2318Z-211006T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
418 PM MST Tue Oct 5 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Northwestern Graham County in southeastern Arizona...

* Until 500 PM MST.

* At 417 PM MST, a severe thunderstorm was located near and 8 miles 
  southeast of San Carlos, or 25 miles east of Globe, moving 
  northeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly remote areas of
  northwestern Graham County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3315 11021 3320 11041 3324 11044 3339 11043
      3340 11040 3340 11037 3343 11032 3343 11029
      3344 11028 3344 11020 3346 11017 3346 11004
TIME...MOT...LOC 2317Z 204DEG 16KT 3329 11033 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

1 follow-up statement

621 
WWUS55 KTWC 052348
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
448 PM MST Tue Oct 5 2021

AZC009-052357-
/O.CAN.KTWC.SV.W.0207.000000T0000Z-211006T0000Z/
Graham-
448 PM MST Tue Oct 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN GRAHAM COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM MST for
southeastern Arizona.

LAT...LON 3315 11021 3320 11041 3324 11044 3339 11043
      3340 11040 3340 11037 3343 11032 3343 11029
      3344 11028 3344 11020 3346 11017 3346 11004
TIME...MOT...LOC 2342Z 204DEG 16KT 3342 11026 

$$

Meyer

The office that day

Everything else NWS Tucson, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 5, 12:41 PM MST	Special Weather Statement	TWC	Cochise	49 min
Oct 5, 12:54 PM MST	Severe Thunderstorm Warning	TWC	Cochise	36 min
Oct 5, 1:27 PM MST	Severe Thunderstorm Warning	TWC	Cochise	48 min
Oct 5, 1:58 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Cochise, Graham	47 min
Oct 5, 2:48 PM MST	Severe Thunderstorm Warning	TWC	Cochise	42 min
Oct 5, 3:23 PM MST	Severe Thunderstorm Warning Considerable damage threat	TWC	Cochise	52 min
Oct 5, 3:32 PM MST	Special Weather Statement	TWC	Graham	58 min
Oct 5, 3:38 PM MST	Severe Thunderstorm Warning	TWC	Pima	52 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.